<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var vm = new Vue({
            el:'#app',
            data:{
                firsrName:'Foo',
                lastName:'Bar',
                //fullName:'Foo Bar' //验证计算属性时，本语句需要注释掉
            },
            watch:{
                firstName:function(val){
                    this.fullName=val+''+this.lastName;
                },
                lastName:function(val){
                    this.fullName=this.firstName+''+val;
                }
            },
            computed:{
                fullName:{
                    //getter
                    get:function(){
                        return thisd.fristName+''+this.lastName;
                    },
                    //setter
                    set:function(newValue){
                        var names = newValue.split('');
                        this.fristName=names[0];
                        this.lastName=names[names.length-1];
                    }
                }
            }
        })
    </script>
    
</body>
</html>